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In the U.S., most greenhouse gas emissions come from for energy use. In 2021, the sources of total annual energy-related carbon dioxide emissions for the U.S. included petroleum (46%), natural gas (34%), and coal (21%).Ìý

In China, the primary CO2 emissions source is coal. The majority of energy (55%) that China generated in 2021 came from coal—and given that coal is carbon-rich, burning it in boilers, industrial plants, and power plants in China releases large amounts of CO2. However, the country has made strides toward in recent years— 70% of energy came from coal in 2001—though fossil fuels still make up the lion's share of energy consumption overall. Most recently, the country's overall CO2 emissions have . In the three fiscal quarters leading up to Q1 2022, emissions have gone down after steady rises in the previous five quarters.

In the European Union, greenhouse gas emissions have dropped 31% since 1990, though this figure does not put the EU on track to meet . Power stations, industrial and large-scale heating plants, and aviation remain the top CO2 culprits.

And in India, include coal power plants, the cattle industry, and rice processing plants. After China, India is the second largest consumer of coal in the world and the third largest single-nation emitter of CO2. Renewable energy sources such as wind and solar have yet to catch on in India; however, the country has set benchmarks to to improve its reliance on cleaner-burning fuels.

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In the U.S., the is renewable energy—and, in 2020, 20% of utility-scale electricity generation came from renewables, with the majority of these renewables being hydropower and wind power.

As for China, despite its heavy reliance on coal, the nation of 1.4 billion is the world's of solar and wind energy. China aims to source from renewable energy by 2025.

In the EU, hydropower and wind power have , accounting for more than two-thirds of electricity generated from renewable sources; for the remaining one-third, solar power and solid biofuels are the main contributors.

India remains heavily dependent on coal and petroleum. Still, as mentioned earlier, the country has of 15% for natural gas sourcing by 2030 as part of a national plan to reduce air pollution. According to business action group Invest India, the country already globally for installed wind and solar power capacity, respectively.

Japan is primarily when it comes to CO2-generating energy sources. While it produces practically no coal or petroleum, it ranks high in consumption against most other countries. Domestically, nuclear and other energy sources are the most significant energy industry.

However, since the incident at the Fukushima nuclear plant in 2011, caused by the conflation of an earthquake and a resulting tsunami that wiped out the plant's emergency generators and released enormous amounts of radiation, the country has begun to shift its focus on energy fuel sourcing. Intending to have of its energy coming from renewables by 2030, Japan aims to use solar, hydropower, wind, biomass, and geothermal energy sources.

In , renewable use as an energy source is low despite the country's many renewables-related resources, such as hydroelectric power, which makes up the majority of the country's capacity for clean energy generation. The country is one of theÌýÌýpetroleum providers and thus one of its most significant users, which will likely not change soon.

Over the last decade, wind and solar power —though, as of 2019, these renewable sources made up less than 4% of the energy sources the country used. That said, since 2000, coal production has gone down in the U.S., while there has been a spike in solar energy production—though it still accounted for just 1% of national energy production in 2018. Solar energy growth occurs on both the large scale (in electronic power plants) and the small scale (in rooftop solar panels).

China has the world's highest share of solar energy consumption—this consumption is significantly higher than in other leading countries like Germany, Japan, and the U.S. The second-most important renewable energy source in China is windpower; the cumulative installed capacity tripled between 2014 and 2021.

Overall, China generates just over 28% of electricity from renewable sources. The Chinese government is to reaching 33% by 2025. Projections suggest nonfossil fuels for energy use across all industrial sectors will hit 20% by that same marker.